Two types of devices were designed and manufactured:
- Digitally controlled millivoltage source (depicted here). This device features a rotary encoder with a push button—the user can change the output voltage (including negative voltage) by rotating the encoder, and cycle through available limits using the push button.
- Type K thermocouple amplifier—this is a simple, USB-powered device that is used in a measurement loop.
A few words
about technology. The digitally controlled millivoltage source PCBs were ordered from a manufacturing plant (with the exception of the prototype which I produced myself), while the thermocouple amplifier devices were all made using the toner transfer technology. All components were hand-soldered and the cases were 3D-printed.
I have also manufactured numerous DAQ and digital control boards which I have used in control experiments throughout my Ph.D. study. Some relevant papers can be found in the publications list.